To run the VexCL test suite using pocl:

1) git clone https://github.com/ddemidov/vexcl.git
2) build the sources if you want to use specific flags or 
   a compiler that is not your default:
   cd vexcl; cmake . ; make
3) configure pocl. It should detect vexcl and enable it as 
   a test suite (see the final messages printed).
